YANG Wen-yuan1,LI Lin2,PENG Xiao-yan2,WANG Ming-lin3,GAO Fei2,ZHANG Yan-xiang2
Abstract：In order to optimize combined blowing technology of oxygen converter, it is necessary to understand the aerodynamic properties of the isothermal tube with frictional adiabatic flow. The key parameters of the gas flow (pressure P, flow Q and thrust F, etc.) are measured by using steel pipe bundles. Combined with theoretical analysis, a series of datum (Mach number M, velocity V, temperature T, density ρ, Froude′s number Fr, entropy increase ΔS, blowing efficiency η, boundary layer thickness δ, etc.) can be obtained to characterize the properties of frictional adiabatic tube flow along the direction of pipe flow and pipe exit. The main measured parameters and the used steel pipes can meet the requirements of the design of converter permeable element. The study on interaction between the bottom blowing air flow and the molten pool, and the formulation of the combined blowing process provide necessary basic data for the development of combined blowing technology. This experiment is the first domestic research to systematically and comprehensively study the frictional adiabatic flow of pipes with crosssections for airpermeable bricks. The used tube bundle method can simplify the experimental equipment and reduce the systematic error of the test data. A formula for calculating the thickness of the boundary layer is proposed based on the size of the steel pipe and the injection efficiency of the adiabatic flow of constant cross section.
